. Comparative anatomy. Anatomy, Comparative. 370 COMPARATIVE ANATOMY pharynx from the endoderm. Successive stages in the process are shown in Figs. 306 and 307. Soon after the tubular heart forms below the pharynx, its wall becomes three layered by proliferation of cells from the outer or epimyocardial layer. In this way, a thick muscular layer is formed between the endo-. B30 HOURS O 32 HOURS T^ 38 HOURS T7' 40 HOUF 10 somites ^ 12 somites -'--' '6 JJ/ 1! somit,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability
. Comparative anatomy. Anatomy, Comparative. 370 COMPARATIVE ANATOMY pharynx from the endoderm. Successive stages in the process are shown in Figs. 306 and 307. Soon after the tubular heart forms below the pharynx, its wall becomes three layered by proliferation of cells from the outer or epimyocardial layer. In this way, a thick muscular layer is formed between the endo-. B30 HOURS O 32 HOURS T^ 38 HOURS T7' 40 HOUF 10 somites ^ 12 somites -'--' '6 JJ/ 1! somit,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Neal, Herbert V. (Herbert Vincent), 1869-1940; Rand, Herbert W. (Herbert Wilbur), 1872-1960. Philadelphia : P. Blakiston's Son
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